Today's Message Index:
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0. 10:09 AM - Please Make a Contribution to Support Your Lists... (Matt Dralle)
1. 10:11 AM - Re: AeroElectric-List Digest: 3 Msgs - 11/16/17 (Gregg Sneek)
2. 11:56 AM - Re: Schottky diode (Carlos Trigo)
3. 05:08 PM - Re: Schottky diode (Robert L. Nuckolls, III)
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Subject: | Please Make a Contribution to Support Your Lists... |
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Subject: | Re: AeroElectric-List Digest: 3 Msgs - 11/16/17 |
Please unsubscribe me.
Get Outlook for Android<https://aka.ms/ghei36>
________________________________
From: owner-aeroelectric-list-server@matronics.com <owner-aeroelectric-list
-server@matronics.com> on behalf of AeroElectric-List Digest Server <aeroel
ectric-list@matronics.com>
Sent: Friday, November 17, 2017 2:01:39 AM
Subject: AeroElectric-List Digest: 3 Msgs - 11/16/17
*
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AeroElectric-List Digest Archive
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Total Messages Posted Thu 11/16/17: 3
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Today's Message Index:
----------------------
1. 02:11 PM - Re: Simple EFIS backup battery wiring (user9253)
2. 09:45 PM - Re: Constructing an automatic RCA video camera feed spli
tter (Airdog77)
3. 10:19 PM - Re: Constructing an automatic RCA video camera feed spli
tter (Eric Page)
________________________________ Message 1 ______________________________
_______
Time: 02:11:50 PM PST US
Subject: AeroElectric-List: Re: Simple EFIS backup battery wiring
From: "user9253" <fransew@gmail.com>
Good job Eric Page. Some aircraft owners and/or builders will appreciate y
our
work.
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=475094#475094
________________________________ Message 2 ______________________________
_______
Time: 09:45:53 PM PST US
Subject: AeroElectric-List: Re: Constructing an automatic RCA video camera
feed
splitter
From: "Airdog77" <Airdog77@gmail.com>
Eric & Alec,
> Once we hear from Wade that his EFIS and video adapter handle the camera
feed
switching OK, I'll edit the schematic and work on a board layout.
Just wanted to let you guys know I hooked up 3 cameras to the switching uni
t that
you recommended Eric and fed it into the GRT EFIS via the switching unit's
RCA jack out into the USB adapter.
The switching worked fine, albeit their is a VERY brief (less than half a s
econd)
skewing of the screen as it goes from one video input to the other. You ha
ve
to be looking right at it to see it.
Again, it all looked fine to me. If we could eliminate the skewing it'd be
nice,
but definitely not a showstopper.
Cheers,
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com<http://www.longezpush.com>
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=475098#475098
________________________________ Message 3 ______________________________
_______
Time: 10:19:11 PM PST US
Subject: AeroElectric-List: Re: Constructing an automatic RCA video camera
feed
splitter
From: "Eric Page" <edpav8r@yahoo.com>
Airdog77 wrote:
> The switching worked fine, albeit their is a VERY brief (less than half a
second)
skewing of the screen as it goes from one video input to the other. You
have to be looking right at it to see it.
I'm glad to hear it works OK and the EFIS doesn't lose sync on the video si
gnal.
Thinking out loud here... the brief skewing you see may have something to d
o
with the mechanical switch. Perhaps it's a break-before-make type, so for
several
milliseconds there's no signal present. With the switching done electronic
ally,
the loss of signal will be reduced to a few tens of nanoseconds, so
that issue *may* disappear.
Eric
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=475099#475099
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Hi Bob
Please see my answers below
De: owner-aeroelectric-list-server@matronics.com
[mailto:owner-aeroelectric-list-server@matronics.com] Em nome de Robert L.
Nuckolls, III
Enviada: Friday, November 17, 2017 11:04 PM
Para: aeroelectric-list@matronics.com
Assunto: Re: AeroElectric-List: Schottky diode
At 10:53 AM 11/17/2017, you wrote:
<mailto:trigo@mail.telepac.pt> >
Guys
In my RV-10 electric system, with 2 batteries and 2 alternators (the Primary
ALT being a Plane Power 60A, and the Secondary ALT being a BC410-H, formerly
known as SD-20), I have a Main Battery contactor and an Aux Battery
contactor.
This being, unless I have the Aux Batt contactor On (closed), the
Alternators will not charge the Aux battery.
Therefore, I am thinking in installing a Schottky diode (I have one from
Perihelion Design sitting in my shelf, which is rated at 60A of maximum
allowable continuous current, and voltage loss around 0,20V), between the
Main battery Buss and the Aux battery + terminal, to allow the alternators
who are charging the Main battery, also to charge the Aux battery, even when
the Aux BATT contactor is not closed.
First question: is there any downside to this solution, or is it even not
recommended at all?
Second question (or more...): in this solution, I should put a fuse in the
wire between the Main Batt buss and the Schottky diode, to protect this
wire, right?
Which is the A recommended for this fuse, 30 A?
And by the way, which wire gauge, AWG#12?
Regards
Carlos
Why not wire like Z-12 with a z-30 second battery?
You're spot on, I do have both arquitectures in my system:
- like in Z-12, the B-Leads of my 2 alternators are both connected to the
same lug in the Starter contactor, thus both alternators charge the Main
Battery
- like in Z-30, the Aux battery is connected, through the Aux Batt.
Contactor, to the downstream lug of the Main Batt contactor, thus the Aux
battery will act as a direct "reinforcement" for the Main battery
Are you planning to have battery bus(es)? Which electro-whizzies will run
from each bus?
I have what you call a "Battery bus" and I called an "Always Hot buss",
directly connected to the Main Battery, only to power the Fuel boost pump
and a cockpit light
And I have what I called an "Avionics Backup buss", which gets power
directly from the Aux battery, through a dedicated relay/contactor, to the
secondary power inputs of all my GARMIN Avionics
Why not fly with both battery contactors closed?
In this case, this is indeed the one-million-dollar question.
My initial request was about to put an extra wire and a Schottky diode,
between the Main battery buss and the Aux battery + terminal, to be able to
charge the Aux battery without closing the Aux Batt contactor.
And this idea had 2 backgrounds: in case the pilot forgets to turn On the
Aux Batt contactor, or in case he doesn't want to turn it On, to "save" the
Aux Battery power (this last being probably a dumb idea).
What do you think about your own question?
Carlos
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>
> Why not wire like Z-12 with a z-30 second battery?
>
>You're spot on, I do have both arquitectures in my system:
> - like in Z-12, the B-Leads of my 2 alternators are both
> connected to the same lug in the Starter contactor, thus both
> alternators charge the Main Battery
Are you intending to use the LR3 generic controller
or the SB1B-14 controller specific to stand-by service?
> - like in Z-30, the Aux battery is connected, through the Aux
> Batt. Contactor, to the downstream lug of the Main Batt contactor,
> thus the Aux battery will act as a direct "reinforcement" for the Main battery
Okay . . .
>
>Are you planning to have battery bus(es)? Which electro-whizzies
>will run from each bus?
>
>I have what you call a "Battery bus" and I called an "Always Hot
>buss", directly connected to the Main Battery, only to power the
>Fuel boost pump and a cockpit light
>And I have what I called an "Avionics Backup buss", which gets power
>directly from the Aux battery, through a dedicated relay/contactor,
>to the secondary power inputs of all my GARMIN Avionics
Understand . . .
>
>Why not fly with both battery contactors closed?
>
>In this case, this is indeed the one-million-dollar question.
>My initial request was about to put an extra wire and a Schottky
>diode, between the Main battery buss and the Aux battery + terminal,
>to be able to charge the Aux battery without closing the Aux Batt contactor.
>And this idea had 2 backgrounds: in case the pilot forgets to turn
>On the Aux Batt contactor,
I really get exercised over the phrase, "Pilot forgets" . . .
Pilots in control of their airplanes don't forget actions
necessary for competent use of the machine . . . pilots
along for the ride are at risk for unhappy days far
worse than improperly positioned controls . . . check
lists used a few dozen times become as automatic as breathing.
> . . . or in case he doesn't want to turn it On, to "save" the Aux
> Battery power (this last being probably a dumb idea).
>What do you think about your own question?
A significant advantage of two batteries is
the ability to isolate the 'avionics' battery
during cranking to side step brown-out issues.
The disadvantage is added weight . . . and 2x
the cost of ownership for battery maintenance
efforts . . . added complexity.
With two alternators, battery only endurance
is insignificant. Hence no reason to fret over
battery capability beyond that need to get
the engine running.
It occurs to me that I've never measured the
brownout characteristics of the lithium ion
products. Given their significantly lower
source impedance, it just might be that these
engine cranking sources would support the
bus at or above the brown-out limits of the
glass-panel products with weak-knees. Has
anyone on the List explored this?
My Sedona has a PM starter on it. I'll put a
task on the to-do bucket to capture a cranking
event trace on the EXP36 battery I have on hand.
Except for mitigation of a brown-out event
(which generally lasts a less than 100
milliseconds), I'm having trouble warming up
to a two-battery configuration. With two
alternators a well maintained battery, I can't
think of any other failure scenario where two
batteries are going to yield a return on investment.
Can't think of a reason your 'avionics bus'
should be any different than the legacy e-bus.
Bob . . .
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